1.Stop using your SD card right now in case of overwriting, which could make your original photos gone permanently.
2. Apply a memory card recovery programs to help. In fact, if you search the word"data recovery program", you can get a piles of recovery programs. You are supposed to select some good and efficient one. If you also hava no idea about it, you could read this text fist and then make your decision:

Recently i deleted some photos from my Olympus E-P3 camera. Those photos are pretty important for me. Is there any possibilities to get them back??

I am using Transcend SD card of on my camera.

Your help would be appreciated.

If you have stopped using your memory card after photo loss you can recover that lost photos. Even the photos are in raw files still you can recover them with some good photo recovery software as when you delete any photo only the space occupied is marked as zero and when you save new photo that marked zero space is given to the new file. In short until you don't save any new file on memory card your photos exists on the same.

Hi.. don't worry if your photos from the has been deleted you can recover them easily. you just need some precautions though , all the necessary details and other tips and trick are available here below

Yes you can perform recovery of all your Photos by an efficient photo recovery software . You can try using ‘Stellar Phoenix Photo Recovery Software’. The software recovers photos from all types of SD cards.